A)
B)
C)
D)
Correct Answer: A
Solution :
When the train is approaching the stationary observer frequency heard by the observer \[{n}'=\frac{v+{{v}_{0}}}{v}n\] when the train is moving away from the observer then frequency heard by the observer \[{n}''=\frac{v-{{v}_{0}}}{v}n\] it is clear that \[{n}'\] and \[{n}''\] are constant and independent of time. Also and n' > n".
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